US831442A - Inductor-alternator. - Google Patents

Description

' PATBNTED SEPT 18, 1906.

. G. A. KELSBY.

INDUGTOR ALTERNATOR.

APPLICATION FILED JULY 6, 1905.

2 SHEEIS-SHEET 1- m W @flwgg Atty No. 831,442. PATENTED SEPT. 18, 1906. G. A. KELSEY.

INDUOTOR ALTERNATOR.

APPLICATION FILED JULY 6, 1905.

$3M 1 M 16M! Atty UNITED STATES P 'rENT OFFICE.

CHARLES OF PITTSFIELD, MASSACHUSETTS, ASSIGNOR TO STANLEY'G. 1.: ELECTRIC MANUFACTURING COMPANY, A COR-PO-" .RATION OF NEWV'JERSEY.

s moucfon- LTERNAToR.

Specification of Lettei Patent.

Patented Sept. 18, 1906.

I0 aZZ wiwnp it may concern.-

Be it known that 1, CHARLES A. KELsEY, a citizen of the United States, residing at Pittsfield, county of Berkshire, State of Massachusetts, have invented certain new and use-' ful Improvements in Inductor-Alternators, of which the following is a specification.

My invention relates to alternating-current generators of the inductor type, and is particularly applicable to high-speed inductor-alternators for comparatively low frequency.

Induetor-alternators are in many respects particularlyadapted for use with prime movers operating at a very high speed, such as steam-turbines, since no sliding contact and no moving wire whatever is required, and consequently the structure of the rotating-inductonnmy readily be designed for great mechanical strength adapted to resist.

high centrifugal strain. As inductor-alternatorslha-ve been constructed heretofore it has been necessary to employ at least two poles on the inductor in order to secure a mechanical balance, and as inductor-alternators are ordinarily arranged one rpvolution of the inductor produces as many complete cycles as there are poles-that'is, a two-pole inductor produces two complete cycles per revolution. Thus an alternator designed for twenty-five cycles would have a speed of seven hundredand fiftv revolutions per minute. which; particularly with small machines, is too low for most efficient operation of a steam-turbine, while for still lower frequencies a still more inefficient speed is required.

The object of'my invention is to provide a novel form of inductor-alternator adapted to give only one cycle for each complete 16V'0lLltion, and thereby to double the speed at which the generator may be operated for any desired frequency.

My invention broadlyjconsists jinnrranging the inductor with a single helical polar projection. Since only one polar projection employed, the n'iac'hi'nc gives only one cycle for each revolutionfand sincethe projection is arranged inja helix tire inductor may be mechanically bala ed,

My invention further 9 hi'pri'ses a number of structural features, which will be best understood by reference to the accompanying drawings, in which Figure 1 shows an end elevation of aninductor alternator arranged in accordance with-my invention. Fig. 2 shows a side-elevation with one-half of the stationary frame removed. -Fig.,3 showsadetail of one of the inductor punchings or laminations, and Fig. 4 shows a detail of the inductor-shaft.

In the drawings, A- represents the frame of' the machine, which is provided with two proeldstructure.

jfcting poles B, like an ordinary bipolar On the poles B 'are mounted the field-coils C, which furnishthe magneti-c zation for the machine. Onthe faces of the poles B are supported laminated cores D,

which are held in place by suitable clampingplates E. Tlfe laminated cores D are arranged with helical slots, as is clearly sho'..n in Fig. 2, and in these slots are placedthe armature-coils F Inthis figure the arma ture-coils are arranged to produce a twophase current, each phase comprisingtwo coils and the-coils of the two phasesubeing displaced from each other ninety electrical degrees. Count ng from left to rightin Fig. 2, coils l and 3 are at the point of maximum induced voltage, since one side of these coils is directly opposite the center of the .polar projection on the inductor. Coils 2 and 4 are at the oint of zero-induced voltage,- since the po ar projection is directly opposite the centers of thesecoils.

G represents the 'indulrtoi' -shaft, which is mounted in suitable hearings not shown) between the field-poles. Sirrrounding the shaft and supported thereby are a'number of punchings or laminations H, arranged 1n planes perpendicular to the axis of the shaft These laminations are shaped, as shown in Fig. 3, like rings or disks of unequal depth on opposite sides. Each lamination thus has one part projecting beyond the 'rest of the punching, and the several unchlngs are so arranged on the inductor-s aft that each-1s displaced circumferentially a small amount In thls manner a. lammfrom the next one; i ated mass is produced having a slngle helical polar projection. As shown mFig. 2, this polar projection makes two completeturns around the inductor. v

In order to secure the'helical arrangement of the punchings, the shaft G may be provided with a s iral groove, as shown n Fig. 4, and the punchings provided with slmllarly inductor neither circumferential nor axial, 'butrin a 'direction rmdway between these two, it may:

' positioned'tongues h, as shown in Fig. 3., ada ted to engage theihelical oove in the she. t.f Thepunchin s are hel in place -on 1 the shaft by suitab e clamping-rings I at eachend. Since the relative movement of the helical 1e and of the armature-slots 'is io be-desirabl'e to laminate the peri hery' of the done in asimple manner by-slotting'the pej riphery of the projection offeach punching,

- asshownathin Fig.3.1a. 15" The machine as abovedescribed evidently gives one cycle PGI'IOVOlIltiOIl, so that by my invention it is possible to operate an inductor -alternator or twenty-five cycles at fife:-

' teen hundred revolutions per mmute or.-.for' sixty cycles at thirty-six hundred revolutiona. r 'j' I do not desireto limit myself to the par ticular construction and arrangement of parts here shown, but aim ii the a'pended claims to cover all modifications w ch are within the scope of my invention. What I claim as new, and desire to, secure by Letters Patentof the; United States, is.' 1. In a dynamo-electric machine, 'a re? volving inductor having a helical polar prosaid inductor, and helically arraiiged station. ary .armatureecoils.

.jectionQa field winding adapted ,jto magnetizef tion, so as to form a laminated mass having a helical polar projection. n

. f4. In,a-'dynamo-electricmachine, an inductor comprising a revolving shaft, and lamina-tio'ns surrounding and supported by the shaft; each lamination being of ,unequal depth on op'posit'e sides and displaced circumferentia laminationso as to form laminat'ed .nass havin a helicalpolariprojection;

ductor comprising a evamp 1 sha with a helicalgrooveaii'd akp uiay of simi-'" -a revolving inductor between said poles having a helical polar projection, and armature of said poles.- I g 8. In a dynamo-electric machine, a bipolar field structure, field-coils carried on the poles laminated cores carried on thqpole faces an field structure, field-coils h laminated cores carried "on 'the pole-faces'and 2. In a.dynaino-electric machine, a statiallya; small amount from the next laminationa y a small amount from the next hand thisBd day "of July, 1905.- 1

. 5. ii a, dynainofelectlj lcamachine, anini' ft? provided I lar ring-shaped laminations surrounding said shaft, each lamination being of unequal 6o depth on'opposite sides and provided with a tongue adapted to engage said groove.

6. In a dynamo-electric machine, a bipol'ar field structure, field-coils carried on the poles, 1

0011s carried on the faces of said poles in in- I .di ctive relation to said inducto'r. inductor-punchings' axially. ,T us ;m ay be field structure, field-coils carried on the poles,

'ing a helical polar pro'ection, 'and'helicallyarranged armature-coi s carried on the faces arranged with helic'al. slots,' .'ariiiature-coils carried in said slots and a revolving inductor between-said 'poles having a helical lav pro 8e jection. r

9. In adynamo-electri "achine, abipolar I ed on the poles,

arranged with helical slots, armature-coils .ca'rried in said slots, a revolving shaft between said poles,v and laminat ons SllIIOlHld',

ing andsupported by said shaft, each lamination being'of unequal de 'th on o posite sides and dis laced circumferential a small 0 amount om the next lamina tion so *asto form alaminated mass having a helical polar projection. v v

10. In a dynamo=elect iemachine, a revolving inductor built up of parallel lamina-"r 5 'tions arranged in-planes ei'pend'i cular to the shaft, each laminationa-ving' af-projecting ortion slotted atitits periphery and being displaced circumferentially asmall amount from .the 'next lamination,"'so as to, form a mo laminated mass having 'ahelical polar 'projection.

11. In-a dynamo-electric machine, a staframe, a field-winding carried thereby, a aminated core carriedby saidjfi-ame and arranged with helical slots, armature coils carried in said slots, and a revolving laminated-inductor havinga helical polar projection, each lamination of said inductor eing slotted at'its .peri hery. v In witnesswher'eof I ave hereunto set my ,CHARLES-A; KELSE'Y. ew i ssesz. f 3r FREDBIGK MURRAY"PIA'IY, 1 Forums THOMPSON. (luitniinsijfy

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